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dmaengine: imx-sdma: Let the core do the device node validation
[linux/fpc-iii.git] / drivers / scsi / bnx2fc / bnx2fc_io.c
blob8def63c0755fec94a694b8035f8a22de163a697c
1 /* bnx2fc_io.c: QLogic Linux FCoE offload driver.
2 * IO manager and SCSI IO processing.
3 *
4 * Copyright (c) 2008-2013 Broadcom Corporation
5 * Copyright (c) 2014-2016 QLogic Corporation
6 * Copyright (c) 2016-2017 Cavium Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation.
11 *
12 * Written by: Bhanu Prakash Gollapudi (bprakash@broadcom.com)
13 */
14
15 #include "bnx2fc.h"
16
17 #define RESERVE_FREE_LIST_INDEX num_possible_cpus()
18
19 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
20 int bd_index);
21 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
22 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
23 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
24 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
25 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
26 struct fcoe_fcp_rsp_payload *fcp_rsp,
27 u8 num_rq);
28
29 void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
30 unsigned int timer_msec)
31 {
32 struct bnx2fc_interface *interface = io_req->port->priv;
33
34 if (queue_delayed_work(interface->timer_work_queue,
35 &io_req->timeout_work,
36 msecs_to_jiffies(timer_msec)))
37 kref_get(&io_req->refcount);
38 }
39
40 static void bnx2fc_cmd_timeout(struct work_struct *work)
41 {
42 struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
43 timeout_work.work);
44 u8 cmd_type = io_req->cmd_type;
45 struct bnx2fc_rport *tgt = io_req->tgt;
46 int rc;
47
48 BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
49 "req_flags = %lx\n", cmd_type, io_req->req_flags);
50
51 spin_lock_bh(&tgt->tgt_lock);
52 if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
53 clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
54 /*
55 * ideally we should hold the io_req until RRQ complets,
56 * and release io_req from timeout hold.
57 */
58 spin_unlock_bh(&tgt->tgt_lock);
59 bnx2fc_send_rrq(io_req);
60 return;
61 }
62 if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
63 BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
64 goto done;
65 }
66
67 switch (cmd_type) {
68 case BNX2FC_SCSI_CMD:
69 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
70 &io_req->req_flags)) {
71 /* Handle eh_abort timeout */
72 BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
73 complete(&io_req->tm_done);
74 } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
75 &io_req->req_flags)) {
76 /* Handle internally generated ABTS timeout */
77 BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
78 kref_read(&io_req->refcount));
79 if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
80 &io_req->req_flags))) {
81 /*
82 * Cleanup and return original command to
83 * mid-layer.
84 */
85 bnx2fc_initiate_cleanup(io_req);
86 kref_put(&io_req->refcount, bnx2fc_cmd_release);
87 spin_unlock_bh(&tgt->tgt_lock);
88
89 return;
90 }
91 } else {
92 /* Hanlde IO timeout */
93 BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
94 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
95 &io_req->req_flags)) {
96 BNX2FC_IO_DBG(io_req, "IO completed before "
97 " timer expiry\n");
98 goto done;
99 }
100
101 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
102 &io_req->req_flags)) {
103 rc = bnx2fc_initiate_abts(io_req);
104 if (rc == SUCCESS)
105 goto done;
106
107 kref_put(&io_req->refcount, bnx2fc_cmd_release);
108 spin_unlock_bh(&tgt->tgt_lock);
109
110 return;
111 } else {
112 BNX2FC_IO_DBG(io_req, "IO already in "
113 "ABTS processing\n");
114 }
115 }
116 break;
117 case BNX2FC_ELS:
118
119 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
120 BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");
121
122 if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
123 &io_req->req_flags)) {
124 kref_put(&io_req->refcount, bnx2fc_cmd_release);
125 spin_unlock_bh(&tgt->tgt_lock);
126
127 return;
128 }
129 } else {
130 /*
131 * Handle ELS timeout.
132 * tgt_lock is used to sync compl path and timeout
133 * path. If els compl path is processing this IO, we
134 * have nothing to do here, just release the timer hold
135 */
136 BNX2FC_IO_DBG(io_req, "ELS timed out\n");
137 if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
138 &io_req->req_flags))
139 goto done;
140
141 /* Indicate the cb_func that this ELS is timed out */
142 set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);
143
144 if ((io_req->cb_func) && (io_req->cb_arg)) {
145 io_req->cb_func(io_req->cb_arg);
146 io_req->cb_arg = NULL;
147 }
148 }
149 break;
150 default:
151 printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
152 cmd_type);
153 break;
154 }
155
156 done:
157 /* release the cmd that was held when timer was set */
158 kref_put(&io_req->refcount, bnx2fc_cmd_release);
159 spin_unlock_bh(&tgt->tgt_lock);
160 }
161
162 static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
163 {
164 /* Called with host lock held */
165 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
166
167 /*
168 * active_cmd_queue may have other command types as well,
169 * and during flush operation, we want to error back only
170 * scsi commands.
171 */
172 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
173 return;
174
175 BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
176 if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
177 /* Do not call scsi done for this IO */
178 return;
179 }
180
181 bnx2fc_unmap_sg_list(io_req);
182 io_req->sc_cmd = NULL;
183
184 /* Sanity checks before returning command to mid-layer */
185 if (!sc_cmd) {
186 printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
187 "IO(0x%x) already cleaned up\n",
188 io_req->xid);
189 return;
190 }
191 if (!sc_cmd->device) {
192 pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
193 return;
194 }
195 if (!sc_cmd->device->host) {
196 pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\n",
197 io_req->xid);
198 return;
199 }
200
201 sc_cmd->result = err_code << 16;
202
203 BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
204 sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
205 sc_cmd->allowed);
206 scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
207 sc_cmd->SCp.ptr = NULL;
208 sc_cmd->scsi_done(sc_cmd);
209 }
210
211 struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba)
212 {
213 struct bnx2fc_cmd_mgr *cmgr;
214 struct io_bdt *bdt_info;
215 struct bnx2fc_cmd *io_req;
216 size_t len;
217 u32 mem_size;
218 u16 xid;
219 int i;
220 int num_ios, num_pri_ios;
221 size_t bd_tbl_sz;
222 int arr_sz = num_possible_cpus() + 1;
223 u16 min_xid = BNX2FC_MIN_XID;
224 u16 max_xid = hba->max_xid;
225
226 if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
227 printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
228 and max_xid 0x%x\n", min_xid, max_xid);
229 return NULL;
230 }
231 BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);
232
233 num_ios = max_xid - min_xid + 1;
234 len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
235 len += sizeof(struct bnx2fc_cmd_mgr);
236
237 cmgr = kzalloc(len, GFP_KERNEL);
238 if (!cmgr) {
239 printk(KERN_ERR PFX "failed to alloc cmgr\n");
240 return NULL;
241 }
242
243 cmgr->hba = hba;
244 cmgr->free_list = kcalloc(arr_sz, sizeof(*cmgr->free_list),
245 GFP_KERNEL);
246 if (!cmgr->free_list) {
247 printk(KERN_ERR PFX "failed to alloc free_list\n");
248 goto mem_err;
249 }
250
251 cmgr->free_list_lock = kcalloc(arr_sz, sizeof(*cmgr->free_list_lock),
252 GFP_KERNEL);
253 if (!cmgr->free_list_lock) {
254 printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
255 kfree(cmgr->free_list);
256 cmgr->free_list = NULL;
257 goto mem_err;
258 }
259
260 cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);
261
262 for (i = 0; i < arr_sz; i++) {
263 INIT_LIST_HEAD(&cmgr->free_list[i]);
264 spin_lock_init(&cmgr->free_list_lock[i]);
265 }
266
267 /*
268 * Pre-allocated pool of bnx2fc_cmds.
269 * Last entry in the free list array is the free list
270 * of slow path requests.
271 */
272 xid = BNX2FC_MIN_XID;
273 num_pri_ios = num_ios - hba->elstm_xids;
274 for (i = 0; i < num_ios; i++) {
275 io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);
276
277 if (!io_req) {
278 printk(KERN_ERR PFX "failed to alloc io_req\n");
279 goto mem_err;
280 }
281
282 INIT_LIST_HEAD(&io_req->link);
283 INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);
284
285 io_req->xid = xid++;
286 if (i < num_pri_ios)
287 list_add_tail(&io_req->link,
288 &cmgr->free_list[io_req->xid %
289 num_possible_cpus()]);
290 else
291 list_add_tail(&io_req->link,
292 &cmgr->free_list[num_possible_cpus()]);
293 io_req++;
294 }
295
296 /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
297 mem_size = num_ios * sizeof(struct io_bdt *);
298 cmgr->io_bdt_pool = kzalloc(mem_size, GFP_KERNEL);
299 if (!cmgr->io_bdt_pool) {
300 printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
301 goto mem_err;
302 }
303
304 mem_size = sizeof(struct io_bdt);
305 for (i = 0; i < num_ios; i++) {
306 cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
307 if (!cmgr->io_bdt_pool[i]) {
308 printk(KERN_ERR PFX "failed to alloc "
309 "io_bdt_pool[%d]\n", i);
310 goto mem_err;
311 }
312 }
313
314 /* Allocate an map fcoe_bdt_ctx structures */
315 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
316 for (i = 0; i < num_ios; i++) {
317 bdt_info = cmgr->io_bdt_pool[i];
318 bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
319 bd_tbl_sz,
320 &bdt_info->bd_tbl_dma,
321 GFP_KERNEL);
322 if (!bdt_info->bd_tbl) {
323 printk(KERN_ERR PFX "failed to alloc "
324 "bdt_tbl[%d]\n", i);
325 goto mem_err;
326 }
327 }
328
329 return cmgr;
330
331 mem_err:
332 bnx2fc_cmd_mgr_free(cmgr);
333 return NULL;
334 }
335
336 void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
337 {
338 struct io_bdt *bdt_info;
339 struct bnx2fc_hba *hba = cmgr->hba;
340 size_t bd_tbl_sz;
341 u16 min_xid = BNX2FC_MIN_XID;
342 u16 max_xid = hba->max_xid;
343 int num_ios;
344 int i;
345
346 num_ios = max_xid - min_xid + 1;
347
348 /* Free fcoe_bdt_ctx structures */
349 if (!cmgr->io_bdt_pool)
350 goto free_cmd_pool;
351
352 bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
353 for (i = 0; i < num_ios; i++) {
354 bdt_info = cmgr->io_bdt_pool[i];
355 if (bdt_info->bd_tbl) {
356 dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
357 bdt_info->bd_tbl,
358 bdt_info->bd_tbl_dma);
359 bdt_info->bd_tbl = NULL;
360 }
361 }
362
363 /* Destroy io_bdt pool */
364 for (i = 0; i < num_ios; i++) {
365 kfree(cmgr->io_bdt_pool[i]);
366 cmgr->io_bdt_pool[i] = NULL;
367 }
368
369 kfree(cmgr->io_bdt_pool);
370 cmgr->io_bdt_pool = NULL;
371
372 free_cmd_pool:
373 kfree(cmgr->free_list_lock);
374
375 /* Destroy cmd pool */
376 if (!cmgr->free_list)
377 goto free_cmgr;
378
379 for (i = 0; i < num_possible_cpus() + 1; i++) {
380 struct bnx2fc_cmd *tmp, *io_req;
381
382 list_for_each_entry_safe(io_req, tmp,
383 &cmgr->free_list[i], link) {
384 list_del(&io_req->link);
385 kfree(io_req);
386 }
387 }
388 kfree(cmgr->free_list);
389 free_cmgr:
390 /* Free command manager itself */
391 kfree(cmgr);
392 }
393
394 struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
395 {
396 struct fcoe_port *port = tgt->port;
397 struct bnx2fc_interface *interface = port->priv;
398 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
399 struct bnx2fc_cmd *io_req;
400 struct list_head *listp;
401 struct io_bdt *bd_tbl;
402 int index = RESERVE_FREE_LIST_INDEX;
403 u32 free_sqes;
404 u32 max_sqes;
405 u16 xid;
406
407 max_sqes = tgt->max_sqes;
408 switch (type) {
409 case BNX2FC_TASK_MGMT_CMD:
410 max_sqes = BNX2FC_TM_MAX_SQES;
411 break;
412 case BNX2FC_ELS:
413 max_sqes = BNX2FC_ELS_MAX_SQES;
414 break;
415 default:
416 break;
417 }
418
419 /*
420 * NOTE: Free list insertions and deletions are protected with
421 * cmgr lock
422 */
423 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
424 free_sqes = atomic_read(&tgt->free_sqes);
425 if ((list_empty(&(cmd_mgr->free_list[index]))) ||
426 (tgt->num_active_ios.counter >= max_sqes) ||
427 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
428 BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
429 "ios(%d):sqes(%d)\n",
430 tgt->num_active_ios.counter, tgt->max_sqes);
431 if (list_empty(&(cmd_mgr->free_list[index])))
432 printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
433 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
434 return NULL;
435 }
436
437 listp = (struct list_head *)
438 cmd_mgr->free_list[index].next;
439 list_del_init(listp);
440 io_req = (struct bnx2fc_cmd *) listp;
441 xid = io_req->xid;
442 cmd_mgr->cmds[xid] = io_req;
443 atomic_inc(&tgt->num_active_ios);
444 atomic_dec(&tgt->free_sqes);
445 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
446
447 INIT_LIST_HEAD(&io_req->link);
448
449 io_req->port = port;
450 io_req->cmd_mgr = cmd_mgr;
451 io_req->req_flags = 0;
452 io_req->cmd_type = type;
453
454 /* Bind io_bdt for this io_req */
455 /* Have a static link between io_req and io_bdt_pool */
456 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
457 bd_tbl->io_req = io_req;
458
459 /* Hold the io_req against deletion */
460 kref_init(&io_req->refcount);
461 return io_req;
462 }
463
464 struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
465 {
466 struct fcoe_port *port = tgt->port;
467 struct bnx2fc_interface *interface = port->priv;
468 struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
469 struct bnx2fc_cmd *io_req;
470 struct list_head *listp;
471 struct io_bdt *bd_tbl;
472 u32 free_sqes;
473 u32 max_sqes;
474 u16 xid;
475 int index = get_cpu();
476
477 max_sqes = BNX2FC_SCSI_MAX_SQES;
478 /*
479 * NOTE: Free list insertions and deletions are protected with
480 * cmgr lock
481 */
482 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
483 free_sqes = atomic_read(&tgt->free_sqes);
484 if ((list_empty(&cmd_mgr->free_list[index])) ||
485 (tgt->num_active_ios.counter >= max_sqes) ||
486 (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
487 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
488 put_cpu();
489 return NULL;
490 }
491
492 listp = (struct list_head *)
493 cmd_mgr->free_list[index].next;
494 list_del_init(listp);
495 io_req = (struct bnx2fc_cmd *) listp;
496 xid = io_req->xid;
497 cmd_mgr->cmds[xid] = io_req;
498 atomic_inc(&tgt->num_active_ios);
499 atomic_dec(&tgt->free_sqes);
500 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
501 put_cpu();
502
503 INIT_LIST_HEAD(&io_req->link);
504
505 io_req->port = port;
506 io_req->cmd_mgr = cmd_mgr;
507 io_req->req_flags = 0;
508
509 /* Bind io_bdt for this io_req */
510 /* Have a static link between io_req and io_bdt_pool */
511 bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
512 bd_tbl->io_req = io_req;
513
514 /* Hold the io_req against deletion */
515 kref_init(&io_req->refcount);
516 return io_req;
517 }
518
519 void bnx2fc_cmd_release(struct kref *ref)
520 {
521 struct bnx2fc_cmd *io_req = container_of(ref,
522 struct bnx2fc_cmd, refcount);
523 struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
524 int index;
525
526 if (io_req->cmd_type == BNX2FC_SCSI_CMD)
527 index = io_req->xid % num_possible_cpus();
528 else
529 index = RESERVE_FREE_LIST_INDEX;
530
531
532 spin_lock_bh(&cmd_mgr->free_list_lock[index]);
533 if (io_req->cmd_type != BNX2FC_SCSI_CMD)
534 bnx2fc_free_mp_resc(io_req);
535 cmd_mgr->cmds[io_req->xid] = NULL;
536 /* Delete IO from retire queue */
537 list_del_init(&io_req->link);
538 /* Add it to the free list */
539 list_add(&io_req->link,
540 &cmd_mgr->free_list[index]);
541 atomic_dec(&io_req->tgt->num_active_ios);
542 spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
543
544 }
545
546 static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
547 {
548 struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
549 struct bnx2fc_interface *interface = io_req->port->priv;
550 struct bnx2fc_hba *hba = interface->hba;
551 size_t sz = sizeof(struct fcoe_bd_ctx);
552
553 /* clear tm flags */
554 mp_req->tm_flags = 0;
555 if (mp_req->mp_req_bd) {
556 dma_free_coherent(&hba->pcidev->dev, sz,
557 mp_req->mp_req_bd,
558 mp_req->mp_req_bd_dma);
559 mp_req->mp_req_bd = NULL;
560 }
561 if (mp_req->mp_resp_bd) {
562 dma_free_coherent(&hba->pcidev->dev, sz,
563 mp_req->mp_resp_bd,
564 mp_req->mp_resp_bd_dma);
565 mp_req->mp_resp_bd = NULL;
566 }
567 if (mp_req->req_buf) {
568 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
569 mp_req->req_buf,
570 mp_req->req_buf_dma);
571 mp_req->req_buf = NULL;
572 }
573 if (mp_req->resp_buf) {
574 dma_free_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
575 mp_req->resp_buf,
576 mp_req->resp_buf_dma);
577 mp_req->resp_buf = NULL;
578 }
579 }
580
581 int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
582 {
583 struct bnx2fc_mp_req *mp_req;
584 struct fcoe_bd_ctx *mp_req_bd;
585 struct fcoe_bd_ctx *mp_resp_bd;
586 struct bnx2fc_interface *interface = io_req->port->priv;
587 struct bnx2fc_hba *hba = interface->hba;
588 dma_addr_t addr;
589 size_t sz;
590
591 mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
592 memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));
593
594 if (io_req->cmd_type != BNX2FC_ELS) {
595 mp_req->req_len = sizeof(struct fcp_cmnd);
596 io_req->data_xfer_len = mp_req->req_len;
597 } else
598 mp_req->req_len = io_req->data_xfer_len;
599
600 mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
601 &mp_req->req_buf_dma,
602 GFP_ATOMIC);
603 if (!mp_req->req_buf) {
604 printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
605 bnx2fc_free_mp_resc(io_req);
606 return FAILED;
607 }
608
609 mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_PAGE_SIZE,
610 &mp_req->resp_buf_dma,
611 GFP_ATOMIC);
612 if (!mp_req->resp_buf) {
613 printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
614 bnx2fc_free_mp_resc(io_req);
615 return FAILED;
616 }
617 memset(mp_req->req_buf, 0, CNIC_PAGE_SIZE);
618 memset(mp_req->resp_buf, 0, CNIC_PAGE_SIZE);
619
620 /* Allocate and map mp_req_bd and mp_resp_bd */
621 sz = sizeof(struct fcoe_bd_ctx);
622 mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
623 &mp_req->mp_req_bd_dma,
624 GFP_ATOMIC);
625 if (!mp_req->mp_req_bd) {
626 printk(KERN_ERR PFX "unable to alloc MP req bd\n");
627 bnx2fc_free_mp_resc(io_req);
628 return FAILED;
629 }
630 mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
631 &mp_req->mp_resp_bd_dma,
632 GFP_ATOMIC);
633 if (!mp_req->mp_resp_bd) {
634 printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
635 bnx2fc_free_mp_resc(io_req);
636 return FAILED;
637 }
638 /* Fill bd table */
639 addr = mp_req->req_buf_dma;
640 mp_req_bd = mp_req->mp_req_bd;
641 mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
642 mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
643 mp_req_bd->buf_len = CNIC_PAGE_SIZE;
644 mp_req_bd->flags = 0;
645
646 /*
647 * MP buffer is either a task mgmt command or an ELS.
648 * So the assumption is that it consumes a single bd
649 * entry in the bd table
650 */
651 mp_resp_bd = mp_req->mp_resp_bd;
652 addr = mp_req->resp_buf_dma;
653 mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
654 mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
655 mp_resp_bd->buf_len = CNIC_PAGE_SIZE;
656 mp_resp_bd->flags = 0;
657
658 return SUCCESS;
659 }
660
661 static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
662 {
663 struct fc_lport *lport;
664 struct fc_rport *rport;
665 struct fc_rport_libfc_priv *rp;
666 struct fcoe_port *port;
667 struct bnx2fc_interface *interface;
668 struct bnx2fc_rport *tgt;
669 struct bnx2fc_cmd *io_req;
670 struct bnx2fc_mp_req *tm_req;
671 struct fcoe_task_ctx_entry *task;
672 struct fcoe_task_ctx_entry *task_page;
673 struct Scsi_Host *host = sc_cmd->device->host;
674 struct fc_frame_header *fc_hdr;
675 struct fcp_cmnd *fcp_cmnd;
676 int task_idx, index;
677 int rc = SUCCESS;
678 u16 xid;
679 u32 sid, did;
680 unsigned long start = jiffies;
681
682 lport = shost_priv(host);
683 rport = starget_to_rport(scsi_target(sc_cmd->device));
684 port = lport_priv(lport);
685 interface = port->priv;
686
687 if (rport == NULL) {
688 printk(KERN_ERR PFX "device_reset: rport is NULL\n");
689 rc = FAILED;
690 goto tmf_err;
691 }
692 rp = rport->dd_data;
693
694 rc = fc_block_scsi_eh(sc_cmd);
695 if (rc)
696 return rc;
697
698 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
699 printk(KERN_ERR PFX "device_reset: link is not ready\n");
700 rc = FAILED;
701 goto tmf_err;
702 }
703 /* rport and tgt are allocated together, so tgt should be non-NULL */
704 tgt = (struct bnx2fc_rport *)&rp[1];
705
706 if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
707 printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
708 rc = FAILED;
709 goto tmf_err;
710 }
711 retry_tmf:
712 io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
713 if (!io_req) {
714 if (time_after(jiffies, start + HZ)) {
715 printk(KERN_ERR PFX "tmf: Failed TMF");
716 rc = FAILED;
717 goto tmf_err;
718 }
719 msleep(20);
720 goto retry_tmf;
721 }
722 /* Initialize rest of io_req fields */
723 io_req->sc_cmd = sc_cmd;
724 io_req->port = port;
725 io_req->tgt = tgt;
726
727 tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
728
729 rc = bnx2fc_init_mp_req(io_req);
730 if (rc == FAILED) {
731 printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
732 spin_lock_bh(&tgt->tgt_lock);
733 kref_put(&io_req->refcount, bnx2fc_cmd_release);
734 spin_unlock_bh(&tgt->tgt_lock);
735 goto tmf_err;
736 }
737
738 /* Set TM flags */
739 io_req->io_req_flags = 0;
740 tm_req->tm_flags = tm_flags;
741
742 /* Fill FCP_CMND */
743 bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
744 fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
745 memset(fcp_cmnd->fc_cdb, 0, sc_cmd->cmd_len);
746 fcp_cmnd->fc_dl = 0;
747
748 /* Fill FC header */
749 fc_hdr = &(tm_req->req_fc_hdr);
750 sid = tgt->sid;
751 did = rport->port_id;
752 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
753 FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
754 FC_FC_SEQ_INIT, 0);
755 /* Obtain exchange id */
756 xid = io_req->xid;
757
758 BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
759 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
760 index = xid % BNX2FC_TASKS_PER_PAGE;
761
762 /* Initialize task context for this IO request */
763 task_page = (struct fcoe_task_ctx_entry *)
764 interface->hba->task_ctx[task_idx];
765 task = &(task_page[index]);
766 bnx2fc_init_mp_task(io_req, task);
767
768 sc_cmd->SCp.ptr = (char *)io_req;
769
770 /* Obtain free SQ entry */
771 spin_lock_bh(&tgt->tgt_lock);
772 bnx2fc_add_2_sq(tgt, xid);
773
774 /* Enqueue the io_req to active_tm_queue */
775 io_req->on_tmf_queue = 1;
776 list_add_tail(&io_req->link, &tgt->active_tm_queue);
777
778 init_completion(&io_req->tm_done);
779 io_req->wait_for_comp = 1;
780
781 /* Ring doorbell */
782 bnx2fc_ring_doorbell(tgt);
783 spin_unlock_bh(&tgt->tgt_lock);
784
785 rc = wait_for_completion_timeout(&io_req->tm_done,
786 interface->tm_timeout * HZ);
787 spin_lock_bh(&tgt->tgt_lock);
788
789 io_req->wait_for_comp = 0;
790 if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
791 set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
792 if (io_req->on_tmf_queue) {
793 list_del_init(&io_req->link);
794 io_req->on_tmf_queue = 0;
795 }
796 io_req->wait_for_comp = 1;
797 bnx2fc_initiate_cleanup(io_req);
798 spin_unlock_bh(&tgt->tgt_lock);
799 rc = wait_for_completion_timeout(&io_req->tm_done,
800 BNX2FC_FW_TIMEOUT);
801 spin_lock_bh(&tgt->tgt_lock);
802 io_req->wait_for_comp = 0;
803 if (!rc)
804 kref_put(&io_req->refcount, bnx2fc_cmd_release);
805 }
806
807 spin_unlock_bh(&tgt->tgt_lock);
808
809 if (!rc) {
810 BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
811 rc = FAILED;
812 } else {
813 BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
814 rc = SUCCESS;
815 }
816 tmf_err:
817 return rc;
818 }
819
820 int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
821 {
822 struct fc_lport *lport;
823 struct bnx2fc_rport *tgt = io_req->tgt;
824 struct fc_rport *rport = tgt->rport;
825 struct fc_rport_priv *rdata = tgt->rdata;
826 struct bnx2fc_interface *interface;
827 struct fcoe_port *port;
828 struct bnx2fc_cmd *abts_io_req;
829 struct fcoe_task_ctx_entry *task;
830 struct fcoe_task_ctx_entry *task_page;
831 struct fc_frame_header *fc_hdr;
832 struct bnx2fc_mp_req *abts_req;
833 int task_idx, index;
834 u32 sid, did;
835 u16 xid;
836 int rc = SUCCESS;
837 u32 r_a_tov = rdata->r_a_tov;
838
839 /* called with tgt_lock held */
840 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");
841
842 port = io_req->port;
843 interface = port->priv;
844 lport = port->lport;
845
846 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
847 printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
848 rc = FAILED;
849 goto abts_err;
850 }
851
852 if (rport == NULL) {
853 printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
854 rc = FAILED;
855 goto abts_err;
856 }
857
858 if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
859 printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
860 rc = FAILED;
861 goto abts_err;
862 }
863
864 abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
865 if (!abts_io_req) {
866 printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
867 rc = FAILED;
868 goto abts_err;
869 }
870
871 /* Initialize rest of io_req fields */
872 abts_io_req->sc_cmd = NULL;
873 abts_io_req->port = port;
874 abts_io_req->tgt = tgt;
875 abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */
876
877 abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
878 memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));
879
880 /* Fill FC header */
881 fc_hdr = &(abts_req->req_fc_hdr);
882
883 /* Obtain oxid and rxid for the original exchange to be aborted */
884 fc_hdr->fh_ox_id = htons(io_req->xid);
885 fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);
886
887 sid = tgt->sid;
888 did = rport->port_id;
889
890 __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
891 FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
892 FC_FC_SEQ_INIT, 0);
893
894 xid = abts_io_req->xid;
895 BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
896 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
897 index = xid % BNX2FC_TASKS_PER_PAGE;
898
899 /* Initialize task context for this IO request */
900 task_page = (struct fcoe_task_ctx_entry *)
901 interface->hba->task_ctx[task_idx];
902 task = &(task_page[index]);
903 bnx2fc_init_mp_task(abts_io_req, task);
904
905 /*
906 * ABTS task is a temporary task that will be cleaned up
907 * irrespective of ABTS response. We need to start the timer
908 * for the original exchange, as the CQE is posted for the original
909 * IO request.
910 *
911 * Timer for ABTS is started only when it is originated by a
912 * TM request. For the ABTS issued as part of ULP timeout,
913 * scsi-ml maintains the timers.
914 */
915
916 /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
917 bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);
918
919 /* Obtain free SQ entry */
920 bnx2fc_add_2_sq(tgt, xid);
921
922 /* Ring doorbell */
923 bnx2fc_ring_doorbell(tgt);
924
925 abts_err:
926 return rc;
927 }
928
929 int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
930 enum fc_rctl r_ctl)
931 {
932 struct fc_lport *lport;
933 struct bnx2fc_rport *tgt = orig_io_req->tgt;
934 struct bnx2fc_interface *interface;
935 struct fcoe_port *port;
936 struct bnx2fc_cmd *seq_clnp_req;
937 struct fcoe_task_ctx_entry *task;
938 struct fcoe_task_ctx_entry *task_page;
939 struct bnx2fc_els_cb_arg *cb_arg = NULL;
940 int task_idx, index;
941 u16 xid;
942 int rc = 0;
943
944 BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
945 orig_io_req->xid);
946 kref_get(&orig_io_req->refcount);
947
948 port = orig_io_req->port;
949 interface = port->priv;
950 lport = port->lport;
951
952 cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
953 if (!cb_arg) {
954 printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
955 rc = -ENOMEM;
956 goto cleanup_err;
957 }
958
959 seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
960 if (!seq_clnp_req) {
961 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
962 rc = -ENOMEM;
963 kfree(cb_arg);
964 goto cleanup_err;
965 }
966 /* Initialize rest of io_req fields */
967 seq_clnp_req->sc_cmd = NULL;
968 seq_clnp_req->port = port;
969 seq_clnp_req->tgt = tgt;
970 seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */
971
972 xid = seq_clnp_req->xid;
973
974 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
975 index = xid % BNX2FC_TASKS_PER_PAGE;
976
977 /* Initialize task context for this IO request */
978 task_page = (struct fcoe_task_ctx_entry *)
979 interface->hba->task_ctx[task_idx];
980 task = &(task_page[index]);
981 cb_arg->aborted_io_req = orig_io_req;
982 cb_arg->io_req = seq_clnp_req;
983 cb_arg->r_ctl = r_ctl;
984 cb_arg->offset = offset;
985 seq_clnp_req->cb_arg = cb_arg;
986
987 printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
988 bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);
989
990 /* Obtain free SQ entry */
991 bnx2fc_add_2_sq(tgt, xid);
992
993 /* Ring doorbell */
994 bnx2fc_ring_doorbell(tgt);
995 cleanup_err:
996 return rc;
997 }
998
999 int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
1000 {
1001 struct fc_lport *lport;
1002 struct bnx2fc_rport *tgt = io_req->tgt;
1003 struct bnx2fc_interface *interface;
1004 struct fcoe_port *port;
1005 struct bnx2fc_cmd *cleanup_io_req;
1006 struct fcoe_task_ctx_entry *task;
1007 struct fcoe_task_ctx_entry *task_page;
1008 int task_idx, index;
1009 u16 xid, orig_xid;
1010 int rc = 0;
1011
1012 /* ASSUMPTION: called with tgt_lock held */
1013 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");
1014
1015 port = io_req->port;
1016 interface = port->priv;
1017 lport = port->lport;
1018
1019 cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
1020 if (!cleanup_io_req) {
1021 printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
1022 rc = -1;
1023 goto cleanup_err;
1024 }
1025
1026 /* Initialize rest of io_req fields */
1027 cleanup_io_req->sc_cmd = NULL;
1028 cleanup_io_req->port = port;
1029 cleanup_io_req->tgt = tgt;
1030 cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */
1031
1032 xid = cleanup_io_req->xid;
1033
1034 task_idx = xid/BNX2FC_TASKS_PER_PAGE;
1035 index = xid % BNX2FC_TASKS_PER_PAGE;
1036
1037 /* Initialize task context for this IO request */
1038 task_page = (struct fcoe_task_ctx_entry *)
1039 interface->hba->task_ctx[task_idx];
1040 task = &(task_page[index]);
1041 orig_xid = io_req->xid;
1042
1043 BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);
1044
1045 bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);
1046
1047 /* Obtain free SQ entry */
1048 bnx2fc_add_2_sq(tgt, xid);
1049
1050 /* Ring doorbell */
1051 bnx2fc_ring_doorbell(tgt);
1052
1053 cleanup_err:
1054 return rc;
1055 }
1056
1057 /**
1058 * bnx2fc_eh_target_reset: Reset a target
1059 *
1060 * @sc_cmd: SCSI command
1061 *
1062 * Set from SCSI host template to send task mgmt command to the target
1063 * and wait for the response
1064 */
1065 int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
1066 {
1067 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
1068 }
1069
1070 /**
1071 * bnx2fc_eh_device_reset - Reset a single LUN
1072 *
1073 * @sc_cmd: SCSI command
1074 *
1075 * Set from SCSI host template to send task mgmt command to the target
1076 * and wait for the response
1077 */
1078 int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
1079 {
1080 return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
1081 }
1082
1083 static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
1084 {
1085 struct bnx2fc_rport *tgt = io_req->tgt;
1086 unsigned int time_left;
1087
1088 io_req->wait_for_comp = 1;
1089 bnx2fc_initiate_cleanup(io_req);
1090
1091 spin_unlock_bh(&tgt->tgt_lock);
1092
1093 /*
1094 * Can't wait forever on cleanup response lest we let the SCSI error
1095 * handler wait forever
1096 */
1097 time_left = wait_for_completion_timeout(&io_req->tm_done,
1098 BNX2FC_FW_TIMEOUT);
1099 io_req->wait_for_comp = 0;
1100 if (!time_left)
1101 BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
1102 __func__);
1103
1104 /*
1105 * Release reference held by SCSI command the cleanup completion
1106 * hits the BNX2FC_CLEANUP case in bnx2fc_process_cq_compl() and
1107 * thus the SCSI command is not returnedi by bnx2fc_scsi_done().
1108 */
1109 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1110
1111 spin_lock_bh(&tgt->tgt_lock);
1112 return SUCCESS;
1113 }
1114
1115 /**
1116 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
1117 * SCSI command
1118 *
1119 * @sc_cmd: SCSI_ML command pointer
1120 *
1121 * SCSI abort request handler
1122 */
1123 int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
1124 {
1125 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1126 struct fc_rport_libfc_priv *rp = rport->dd_data;
1127 struct bnx2fc_cmd *io_req;
1128 struct fc_lport *lport;
1129 struct bnx2fc_rport *tgt;
1130 int rc;
1131 unsigned int time_left;
1132
1133 rc = fc_block_scsi_eh(sc_cmd);
1134 if (rc)
1135 return rc;
1136
1137 lport = shost_priv(sc_cmd->device->host);
1138 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1139 printk(KERN_ERR PFX "eh_abort: link not ready\n");
1140 return FAILED;
1141 }
1142
1143 tgt = (struct bnx2fc_rport *)&rp[1];
1144
1145 BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");
1146
1147 spin_lock_bh(&tgt->tgt_lock);
1148 io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
1149 if (!io_req) {
1150 /* Command might have just completed */
1151 printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
1152 spin_unlock_bh(&tgt->tgt_lock);
1153 return SUCCESS;
1154 }
1155 BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
1156 kref_read(&io_req->refcount));
1157
1158 /* Hold IO request across abort processing */
1159 kref_get(&io_req->refcount);
1160
1161 BUG_ON(tgt != io_req->tgt);
1162
1163 /* Remove the io_req from the active_q. */
1164 /*
1165 * Task Mgmt functions (LUN RESET & TGT RESET) will not
1166 * issue an ABTS on this particular IO req, as the
1167 * io_req is no longer in the active_q.
1168 */
1169 if (tgt->flush_in_prog) {
1170 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1171 "flush in progress\n", io_req->xid);
1172 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1173 spin_unlock_bh(&tgt->tgt_lock);
1174 return SUCCESS;
1175 }
1176
1177 if (io_req->on_active_queue == 0) {
1178 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1179 "not on active_q\n", io_req->xid);
1180 /*
1181 * The IO is still with the FW.
1182 * Return failure and let SCSI-ml retry eh_abort.
1183 */
1184 spin_unlock_bh(&tgt->tgt_lock);
1185 return FAILED;
1186 }
1187
1188 /*
1189 * Only eh_abort processing will remove the IO from
1190 * active_cmd_q before processing the request. this is
1191 * done to avoid race conditions between IOs aborted
1192 * as part of task management completion and eh_abort
1193 * processing
1194 */
1195 list_del_init(&io_req->link);
1196 io_req->on_active_queue = 0;
1197 /* Move IO req to retire queue */
1198 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1199
1200 init_completion(&io_req->tm_done);
1201
1202 if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
1203 printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
1204 "already in abts processing\n", io_req->xid);
1205 if (cancel_delayed_work(&io_req->timeout_work))
1206 kref_put(&io_req->refcount,
1207 bnx2fc_cmd_release); /* drop timer hold */
1208 /*
1209 * We don't want to hold off the upper layer timer so simply
1210 * cleanup the command and return that I/O was successfully
1211 * aborted.
1212 */
1213 rc = bnx2fc_abts_cleanup(io_req);
1214 /* This only occurs when an task abort was requested while ABTS
1215 is in progress. Setting the IO_CLEANUP flag will skip the
1216 RRQ process in the case when the fw generated SCSI_CMD cmpl
1217 was a result from the ABTS request rather than the CLEANUP
1218 request */
1219 set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
1220 goto done;
1221 }
1222
1223 /* Cancel the current timer running on this io_req */
1224 if (cancel_delayed_work(&io_req->timeout_work))
1225 kref_put(&io_req->refcount,
1226 bnx2fc_cmd_release); /* drop timer hold */
1227 set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
1228 io_req->wait_for_comp = 1;
1229 rc = bnx2fc_initiate_abts(io_req);
1230 if (rc == FAILED) {
1231 bnx2fc_initiate_cleanup(io_req);
1232 spin_unlock_bh(&tgt->tgt_lock);
1233 wait_for_completion(&io_req->tm_done);
1234 spin_lock_bh(&tgt->tgt_lock);
1235 io_req->wait_for_comp = 0;
1236 goto done;
1237 }
1238 spin_unlock_bh(&tgt->tgt_lock);
1239
1240 /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
1241 time_left = wait_for_completion_timeout(&io_req->tm_done,
1242 (2 * rp->r_a_tov + 1) * HZ);
1243 if (time_left)
1244 BNX2FC_IO_DBG(io_req, "Timed out in eh_abort waiting for tm_done");
1245
1246 spin_lock_bh(&tgt->tgt_lock);
1247 io_req->wait_for_comp = 0;
1248 if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1249 BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
1250 rc = SUCCESS;
1251 } else if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1252 &io_req->req_flags))) {
1253 /* Let the scsi-ml try to recover this command */
1254 printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
1255 io_req->xid);
1256 /*
1257 * Cleanup firmware residuals before returning control back
1258 * to SCSI ML.
1259 */
1260 rc = bnx2fc_abts_cleanup(io_req);
1261 goto done;
1262 } else {
1263 /*
1264 * We come here even when there was a race condition
1265 * between timeout and abts completion, and abts
1266 * completion happens just in time.
1267 */
1268 BNX2FC_IO_DBG(io_req, "abort succeeded\n");
1269 rc = SUCCESS;
1270 bnx2fc_scsi_done(io_req, DID_ABORT);
1271 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1272 }
1273 done:
1274 /* release the reference taken in eh_abort */
1275 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1276 spin_unlock_bh(&tgt->tgt_lock);
1277 return rc;
1278 }
1279
1280 void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
1281 struct fcoe_task_ctx_entry *task,
1282 u8 rx_state)
1283 {
1284 struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
1285 struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
1286 u32 offset = cb_arg->offset;
1287 enum fc_rctl r_ctl = cb_arg->r_ctl;
1288 int rc = 0;
1289 struct bnx2fc_rport *tgt = orig_io_req->tgt;
1290
1291 BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
1292 "cmd_type = %d\n",
1293 seq_clnp_req->xid, seq_clnp_req->cmd_type);
1294
1295 if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
1296 printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
1297 seq_clnp_req->xid);
1298 goto free_cb_arg;
1299 }
1300
1301 spin_unlock_bh(&tgt->tgt_lock);
1302 rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
1303 spin_lock_bh(&tgt->tgt_lock);
1304
1305 if (rc)
1306 printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
1307 " IO will abort\n");
1308 seq_clnp_req->cb_arg = NULL;
1309 kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
1310 free_cb_arg:
1311 kfree(cb_arg);
1312 return;
1313 }
1314
1315 void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
1316 struct fcoe_task_ctx_entry *task,
1317 u8 num_rq)
1318 {
1319 BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
1320 "refcnt = %d, cmd_type = %d\n",
1321 kref_read(&io_req->refcount), io_req->cmd_type);
1322 bnx2fc_scsi_done(io_req, DID_ERROR);
1323 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1324 if (io_req->wait_for_comp)
1325 complete(&io_req->tm_done);
1326 }
1327
1328 void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
1329 struct fcoe_task_ctx_entry *task,
1330 u8 num_rq)
1331 {
1332 u32 r_ctl;
1333 u32 r_a_tov = FC_DEF_R_A_TOV;
1334 u8 issue_rrq = 0;
1335 struct bnx2fc_rport *tgt = io_req->tgt;
1336
1337 BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
1338 "refcnt = %d, cmd_type = %d\n",
1339 io_req->xid,
1340 kref_read(&io_req->refcount), io_req->cmd_type);
1341
1342 if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
1343 &io_req->req_flags)) {
1344 BNX2FC_IO_DBG(io_req, "Timer context finished processing"
1345 " this io\n");
1346 return;
1347 }
1348
1349 /* Do not issue RRQ as this IO is already cleanedup */
1350 if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
1351 &io_req->req_flags))
1352 goto io_compl;
1353
1354 /*
1355 * For ABTS issued due to SCSI eh_abort_handler, timeout
1356 * values are maintained by scsi-ml itself. Cancel timeout
1357 * in case ABTS issued as part of task management function
1358 * or due to FW error.
1359 */
1360 if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
1361 if (cancel_delayed_work(&io_req->timeout_work))
1362 kref_put(&io_req->refcount,
1363 bnx2fc_cmd_release); /* drop timer hold */
1364
1365 r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;
1366
1367 switch (r_ctl) {
1368 case FC_RCTL_BA_ACC:
1369 /*
1370 * Dont release this cmd yet. It will be relesed
1371 * after we get RRQ response
1372 */
1373 BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
1374 issue_rrq = 1;
1375 break;
1376
1377 case FC_RCTL_BA_RJT:
1378 BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
1379 break;
1380 default:
1381 printk(KERN_ERR PFX "Unknown ABTS response\n");
1382 break;
1383 }
1384
1385 if (issue_rrq) {
1386 BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
1387 set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
1388 }
1389 set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
1390 bnx2fc_cmd_timer_set(io_req, r_a_tov);
1391
1392 io_compl:
1393 if (io_req->wait_for_comp) {
1394 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1395 &io_req->req_flags))
1396 complete(&io_req->tm_done);
1397 } else {
1398 /*
1399 * We end up here when ABTS is issued as
1400 * in asynchronous context, i.e., as part
1401 * of task management completion, or
1402 * when FW error is received or when the
1403 * ABTS is issued when the IO is timed
1404 * out.
1405 */
1406
1407 if (io_req->on_active_queue) {
1408 list_del_init(&io_req->link);
1409 io_req->on_active_queue = 0;
1410 /* Move IO req to retire queue */
1411 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1412 }
1413 bnx2fc_scsi_done(io_req, DID_ERROR);
1414 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1415 }
1416 }
1417
1418 static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
1419 {
1420 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1421 struct bnx2fc_rport *tgt = io_req->tgt;
1422 struct bnx2fc_cmd *cmd, *tmp;
1423 u64 tm_lun = sc_cmd->device->lun;
1424 u64 lun;
1425 int rc = 0;
1426
1427 /* called with tgt_lock held */
1428 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
1429 /*
1430 * Walk thru the active_ios queue and ABORT the IO
1431 * that matches with the LUN that was reset
1432 */
1433 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1434 BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
1435 lun = cmd->sc_cmd->device->lun;
1436 if (lun == tm_lun) {
1437 /* Initiate ABTS on this cmd */
1438 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1439 &cmd->req_flags)) {
1440 /* cancel the IO timeout */
1441 if (cancel_delayed_work(&io_req->timeout_work))
1442 kref_put(&io_req->refcount,
1443 bnx2fc_cmd_release);
1444 /* timer hold */
1445 rc = bnx2fc_initiate_abts(cmd);
1446 /* abts shouldn't fail in this context */
1447 WARN_ON(rc != SUCCESS);
1448 } else
1449 printk(KERN_ERR PFX "lun_rst: abts already in"
1450 " progress for this IO 0x%x\n",
1451 cmd->xid);
1452 }
1453 }
1454 }
1455
1456 static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
1457 {
1458 struct bnx2fc_rport *tgt = io_req->tgt;
1459 struct bnx2fc_cmd *cmd, *tmp;
1460 int rc = 0;
1461
1462 /* called with tgt_lock held */
1463 BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
1464 /*
1465 * Walk thru the active_ios queue and ABORT the IO
1466 * that matches with the LUN that was reset
1467 */
1468 list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
1469 BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
1470 /* Initiate ABTS */
1471 if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
1472 &cmd->req_flags)) {
1473 /* cancel the IO timeout */
1474 if (cancel_delayed_work(&io_req->timeout_work))
1475 kref_put(&io_req->refcount,
1476 bnx2fc_cmd_release); /* timer hold */
1477 rc = bnx2fc_initiate_abts(cmd);
1478 /* abts shouldn't fail in this context */
1479 WARN_ON(rc != SUCCESS);
1480
1481 } else
1482 printk(KERN_ERR PFX "tgt_rst: abts already in progress"
1483 " for this IO 0x%x\n", cmd->xid);
1484 }
1485 }
1486
1487 void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
1488 struct fcoe_task_ctx_entry *task, u8 num_rq)
1489 {
1490 struct bnx2fc_mp_req *tm_req;
1491 struct fc_frame_header *fc_hdr;
1492 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1493 u64 *hdr;
1494 u64 *temp_hdr;
1495 void *rsp_buf;
1496
1497 /* Called with tgt_lock held */
1498 BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");
1499
1500 if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
1501 set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
1502 else {
1503 /* TM has already timed out and we got
1504 * delayed completion. Ignore completion
1505 * processing.
1506 */
1507 return;
1508 }
1509
1510 tm_req = &(io_req->mp_req);
1511 fc_hdr = &(tm_req->resp_fc_hdr);
1512 hdr = (u64 *)fc_hdr;
1513 temp_hdr = (u64 *)
1514 &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
1515 hdr[0] = cpu_to_be64(temp_hdr[0]);
1516 hdr[1] = cpu_to_be64(temp_hdr[1]);
1517 hdr[2] = cpu_to_be64(temp_hdr[2]);
1518
1519 tm_req->resp_len =
1520 task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;
1521
1522 rsp_buf = tm_req->resp_buf;
1523
1524 if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
1525 bnx2fc_parse_fcp_rsp(io_req,
1526 (struct fcoe_fcp_rsp_payload *)
1527 rsp_buf, num_rq);
1528 if (io_req->fcp_rsp_code == 0) {
1529 /* TM successful */
1530 if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
1531 bnx2fc_lun_reset_cmpl(io_req);
1532 else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
1533 bnx2fc_tgt_reset_cmpl(io_req);
1534 }
1535 } else {
1536 printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
1537 fc_hdr->fh_r_ctl);
1538 }
1539 if (!sc_cmd->SCp.ptr) {
1540 printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
1541 return;
1542 }
1543 switch (io_req->fcp_status) {
1544 case FC_GOOD:
1545 if (io_req->cdb_status == 0) {
1546 /* Good IO completion */
1547 sc_cmd->result = DID_OK << 16;
1548 } else {
1549 /* Transport status is good, SCSI status not good */
1550 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1551 }
1552 if (io_req->fcp_resid)
1553 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1554 break;
1555
1556 default:
1557 BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
1558 io_req->fcp_status);
1559 break;
1560 }
1561
1562 sc_cmd = io_req->sc_cmd;
1563 io_req->sc_cmd = NULL;
1564
1565 /* check if the io_req exists in tgt's tmf_q */
1566 if (io_req->on_tmf_queue) {
1567
1568 list_del_init(&io_req->link);
1569 io_req->on_tmf_queue = 0;
1570 } else {
1571
1572 printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
1573 return;
1574 }
1575
1576 sc_cmd->SCp.ptr = NULL;
1577 sc_cmd->scsi_done(sc_cmd);
1578
1579 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1580 if (io_req->wait_for_comp) {
1581 BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
1582 complete(&io_req->tm_done);
1583 }
1584 }
1585
1586 static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
1587 int bd_index)
1588 {
1589 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1590 int frag_size, sg_frags;
1591
1592 sg_frags = 0;
1593 while (sg_len) {
1594 if (sg_len >= BNX2FC_BD_SPLIT_SZ)
1595 frag_size = BNX2FC_BD_SPLIT_SZ;
1596 else
1597 frag_size = sg_len;
1598 bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
1599 bd[bd_index + sg_frags].buf_addr_hi = addr >> 32;
1600 bd[bd_index + sg_frags].buf_len = (u16)frag_size;
1601 bd[bd_index + sg_frags].flags = 0;
1602
1603 addr += (u64) frag_size;
1604 sg_frags++;
1605 sg_len -= frag_size;
1606 }
1607 return sg_frags;
1608
1609 }
1610
1611 static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
1612 {
1613 struct bnx2fc_interface *interface = io_req->port->priv;
1614 struct bnx2fc_hba *hba = interface->hba;
1615 struct scsi_cmnd *sc = io_req->sc_cmd;
1616 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1617 struct scatterlist *sg;
1618 int byte_count = 0;
1619 int sg_count = 0;
1620 int bd_count = 0;
1621 int sg_frags;
1622 unsigned int sg_len;
1623 u64 addr;
1624 int i;
1625
1626 /*
1627 * Use dma_map_sg directly to ensure we're using the correct
1628 * dev struct off of pcidev.
1629 */
1630 sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
1631 scsi_sg_count(sc), sc->sc_data_direction);
1632 scsi_for_each_sg(sc, sg, sg_count, i) {
1633 sg_len = sg_dma_len(sg);
1634 addr = sg_dma_address(sg);
1635 if (sg_len > BNX2FC_MAX_BD_LEN) {
1636 sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
1637 bd_count);
1638 } else {
1639
1640 sg_frags = 1;
1641 bd[bd_count].buf_addr_lo = addr & 0xffffffff;
1642 bd[bd_count].buf_addr_hi = addr >> 32;
1643 bd[bd_count].buf_len = (u16)sg_len;
1644 bd[bd_count].flags = 0;
1645 }
1646 bd_count += sg_frags;
1647 byte_count += sg_len;
1648 }
1649 if (byte_count != scsi_bufflen(sc))
1650 printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
1651 "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
1652 io_req->xid);
1653 return bd_count;
1654 }
1655
1656 static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
1657 {
1658 struct scsi_cmnd *sc = io_req->sc_cmd;
1659 struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
1660 int bd_count;
1661
1662 if (scsi_sg_count(sc)) {
1663 bd_count = bnx2fc_map_sg(io_req);
1664 if (bd_count == 0)
1665 return -ENOMEM;
1666 } else {
1667 bd_count = 0;
1668 bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
1669 bd[0].buf_len = bd[0].flags = 0;
1670 }
1671 io_req->bd_tbl->bd_valid = bd_count;
1672
1673 return 0;
1674 }
1675
1676 static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
1677 {
1678 struct scsi_cmnd *sc = io_req->sc_cmd;
1679 struct bnx2fc_interface *interface = io_req->port->priv;
1680 struct bnx2fc_hba *hba = interface->hba;
1681
1682 /*
1683 * Use dma_unmap_sg directly to ensure we're using the correct
1684 * dev struct off of pcidev.
1685 */
1686 if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
1687 dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
1688 scsi_sg_count(sc), sc->sc_data_direction);
1689 io_req->bd_tbl->bd_valid = 0;
1690 }
1691 }
1692
1693 void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
1694 struct fcp_cmnd *fcp_cmnd)
1695 {
1696 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1697
1698 memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));
1699
1700 int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);
1701
1702 fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
1703 memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
1704
1705 fcp_cmnd->fc_cmdref = 0;
1706 fcp_cmnd->fc_pri_ta = 0;
1707 fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
1708 fcp_cmnd->fc_flags = io_req->io_req_flags;
1709 fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
1710 }
1711
1712 static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
1713 struct fcoe_fcp_rsp_payload *fcp_rsp,
1714 u8 num_rq)
1715 {
1716 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1717 struct bnx2fc_rport *tgt = io_req->tgt;
1718 u8 rsp_flags = fcp_rsp->fcp_flags.flags;
1719 u32 rq_buff_len = 0;
1720 int i;
1721 unsigned char *rq_data;
1722 unsigned char *dummy;
1723 int fcp_sns_len = 0;
1724 int fcp_rsp_len = 0;
1725
1726 io_req->fcp_status = FC_GOOD;
1727 io_req->fcp_resid = 0;
1728 if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
1729 FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
1730 io_req->fcp_resid = fcp_rsp->fcp_resid;
1731
1732 io_req->scsi_comp_flags = rsp_flags;
1733 CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
1734 fcp_rsp->scsi_status_code;
1735
1736 /* Fetch fcp_rsp_info and fcp_sns_info if available */
1737 if (num_rq) {
1738
1739 /*
1740 * We do not anticipate num_rq >1, as the linux defined
1741 * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
1742 * 256 bytes of single rq buffer is good enough to hold this.
1743 */
1744
1745 if (rsp_flags &
1746 FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
1747 fcp_rsp_len = rq_buff_len
1748 = fcp_rsp->fcp_rsp_len;
1749 }
1750
1751 if (rsp_flags &
1752 FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
1753 fcp_sns_len = fcp_rsp->fcp_sns_len;
1754 rq_buff_len += fcp_rsp->fcp_sns_len;
1755 }
1756
1757 io_req->fcp_rsp_len = fcp_rsp_len;
1758 io_req->fcp_sns_len = fcp_sns_len;
1759
1760 if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
1761 /* Invalid sense sense length. */
1762 printk(KERN_ERR PFX "invalid sns length %d\n",
1763 rq_buff_len);
1764 /* reset rq_buff_len */
1765 rq_buff_len = num_rq * BNX2FC_RQ_BUF_SZ;
1766 }
1767
1768 rq_data = bnx2fc_get_next_rqe(tgt, 1);
1769
1770 if (num_rq > 1) {
1771 /* We do not need extra sense data */
1772 for (i = 1; i < num_rq; i++)
1773 dummy = bnx2fc_get_next_rqe(tgt, 1);
1774 }
1775
1776 /* fetch fcp_rsp_code */
1777 if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
1778 /* Only for task management function */
1779 io_req->fcp_rsp_code = rq_data[3];
1780 BNX2FC_IO_DBG(io_req, "fcp_rsp_code = %d\n",
1781 io_req->fcp_rsp_code);
1782 }
1783
1784 /* fetch sense data */
1785 rq_data += fcp_rsp_len;
1786
1787 if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
1788 printk(KERN_ERR PFX "Truncating sense buffer\n");
1789 fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
1790 }
1791
1792 memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1793 if (fcp_sns_len)
1794 memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);
1795
1796 /* return RQ entries */
1797 for (i = 0; i < num_rq; i++)
1798 bnx2fc_return_rqe(tgt, 1);
1799 }
1800 }
1801
1802 /**
1803 * bnx2fc_queuecommand - Queuecommand function of the scsi template
1804 *
1805 * @host: The Scsi_Host the command was issued to
1806 * @sc_cmd: struct scsi_cmnd to be executed
1807 *
1808 * This is the IO strategy routine, called by SCSI-ML
1809 **/
1810 int bnx2fc_queuecommand(struct Scsi_Host *host,
1811 struct scsi_cmnd *sc_cmd)
1812 {
1813 struct fc_lport *lport = shost_priv(host);
1814 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1815 struct fc_rport_libfc_priv *rp = rport->dd_data;
1816 struct bnx2fc_rport *tgt;
1817 struct bnx2fc_cmd *io_req;
1818 int rc = 0;
1819 int rval;
1820
1821 rval = fc_remote_port_chkready(rport);
1822 if (rval) {
1823 sc_cmd->result = rval;
1824 sc_cmd->scsi_done(sc_cmd);
1825 return 0;
1826 }
1827
1828 if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
1829 rc = SCSI_MLQUEUE_HOST_BUSY;
1830 goto exit_qcmd;
1831 }
1832
1833 /* rport and tgt are allocated together, so tgt should be non-NULL */
1834 tgt = (struct bnx2fc_rport *)&rp[1];
1835
1836 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
1837 /*
1838 * Session is not offloaded yet. Let SCSI-ml retry
1839 * the command.
1840 */
1841 rc = SCSI_MLQUEUE_TARGET_BUSY;
1842 goto exit_qcmd;
1843 }
1844 if (tgt->retry_delay_timestamp) {
1845 if (time_after(jiffies, tgt->retry_delay_timestamp)) {
1846 tgt->retry_delay_timestamp = 0;
1847 } else {
1848 /* If retry_delay timer is active, flow off the ML */
1849 rc = SCSI_MLQUEUE_TARGET_BUSY;
1850 goto exit_qcmd;
1851 }
1852 }
1853
1854 spin_lock_bh(&tgt->tgt_lock);
1855
1856 io_req = bnx2fc_cmd_alloc(tgt);
1857 if (!io_req) {
1858 rc = SCSI_MLQUEUE_HOST_BUSY;
1859 goto exit_qcmd_tgtlock;
1860 }
1861 io_req->sc_cmd = sc_cmd;
1862
1863 if (bnx2fc_post_io_req(tgt, io_req)) {
1864 printk(KERN_ERR PFX "Unable to post io_req\n");
1865 rc = SCSI_MLQUEUE_HOST_BUSY;
1866 goto exit_qcmd_tgtlock;
1867 }
1868
1869 exit_qcmd_tgtlock:
1870 spin_unlock_bh(&tgt->tgt_lock);
1871 exit_qcmd:
1872 return rc;
1873 }
1874
1875 void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
1876 struct fcoe_task_ctx_entry *task,
1877 u8 num_rq)
1878 {
1879 struct fcoe_fcp_rsp_payload *fcp_rsp;
1880 struct bnx2fc_rport *tgt = io_req->tgt;
1881 struct scsi_cmnd *sc_cmd;
1882 struct Scsi_Host *host;
1883
1884
1885 /* scsi_cmd_cmpl is called with tgt lock held */
1886
1887 if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
1888 /* we will not receive ABTS response for this IO */
1889 BNX2FC_IO_DBG(io_req, "Timer context finished processing "
1890 "this scsi cmd\n");
1891 return;
1892 }
1893
1894 /* Cancel the timeout_work, as we received IO completion */
1895 if (cancel_delayed_work(&io_req->timeout_work))
1896 kref_put(&io_req->refcount,
1897 bnx2fc_cmd_release); /* drop timer hold */
1898
1899 sc_cmd = io_req->sc_cmd;
1900 if (sc_cmd == NULL) {
1901 printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
1902 return;
1903 }
1904
1905 /* Fetch fcp_rsp from task context and perform cmd completion */
1906 fcp_rsp = (struct fcoe_fcp_rsp_payload *)
1907 &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);
1908
1909 /* parse fcp_rsp and obtain sense data from RQ if available */
1910 bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);
1911
1912 host = sc_cmd->device->host;
1913 if (!sc_cmd->SCp.ptr) {
1914 printk(KERN_ERR PFX "SCp.ptr is NULL\n");
1915 return;
1916 }
1917
1918 if (io_req->on_active_queue) {
1919 list_del_init(&io_req->link);
1920 io_req->on_active_queue = 0;
1921 /* Move IO req to retire queue */
1922 list_add_tail(&io_req->link, &tgt->io_retire_queue);
1923 } else {
1924 /* This should not happen, but could have been pulled
1925 * by bnx2fc_flush_active_ios(), or during a race
1926 * between command abort and (late) completion.
1927 */
1928 BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
1929 if (io_req->wait_for_comp)
1930 if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
1931 &io_req->req_flags))
1932 complete(&io_req->tm_done);
1933 }
1934
1935 bnx2fc_unmap_sg_list(io_req);
1936 io_req->sc_cmd = NULL;
1937
1938 switch (io_req->fcp_status) {
1939 case FC_GOOD:
1940 if (io_req->cdb_status == 0) {
1941 /* Good IO completion */
1942 sc_cmd->result = DID_OK << 16;
1943 } else {
1944 /* Transport status is good, SCSI status not good */
1945 BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
1946 " fcp_resid = 0x%x\n",
1947 io_req->cdb_status, io_req->fcp_resid);
1948 sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
1949
1950 if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
1951 io_req->cdb_status == SAM_STAT_BUSY) {
1952 /* Set the jiffies + retry_delay_timer * 100ms
1953 for the rport/tgt */
1954 tgt->retry_delay_timestamp = jiffies +
1955 fcp_rsp->retry_delay_timer * HZ / 10;
1956 }
1957
1958 }
1959 if (io_req->fcp_resid)
1960 scsi_set_resid(sc_cmd, io_req->fcp_resid);
1961 break;
1962 default:
1963 printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
1964 io_req->fcp_status);
1965 break;
1966 }
1967 sc_cmd->SCp.ptr = NULL;
1968 sc_cmd->scsi_done(sc_cmd);
1969 kref_put(&io_req->refcount, bnx2fc_cmd_release);
1970 }
1971
1972 int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
1973 struct bnx2fc_cmd *io_req)
1974 {
1975 struct fcoe_task_ctx_entry *task;
1976 struct fcoe_task_ctx_entry *task_page;
1977 struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
1978 struct fcoe_port *port = tgt->port;
1979 struct bnx2fc_interface *interface = port->priv;
1980 struct bnx2fc_hba *hba = interface->hba;
1981 struct fc_lport *lport = port->lport;
1982 struct fc_stats *stats;
1983 int task_idx, index;
1984 u16 xid;
1985
1986 /* bnx2fc_post_io_req() is called with the tgt_lock held */
1987
1988 /* Initialize rest of io_req fields */
1989 io_req->cmd_type = BNX2FC_SCSI_CMD;
1990 io_req->port = port;
1991 io_req->tgt = tgt;
1992 io_req->data_xfer_len = scsi_bufflen(sc_cmd);
1993 sc_cmd->SCp.ptr = (char *)io_req;
1994
1995 stats = per_cpu_ptr(lport->stats, get_cpu());
1996 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1997 io_req->io_req_flags = BNX2FC_READ;
1998 stats->InputRequests++;
1999 stats->InputBytes += io_req->data_xfer_len;
2000 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
2001 io_req->io_req_flags = BNX2FC_WRITE;
2002 stats->OutputRequests++;
2003 stats->OutputBytes += io_req->data_xfer_len;
2004 } else {
2005 io_req->io_req_flags = 0;
2006 stats->ControlRequests++;
2007 }
2008 put_cpu();
2009
2010 xid = io_req->xid;
2011
2012 /* Build buffer descriptor list for firmware from sg list */
2013 if (bnx2fc_build_bd_list_from_sg(io_req)) {
2014 printk(KERN_ERR PFX "BD list creation failed\n");
2015 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2016 return -EAGAIN;
2017 }
2018
2019 task_idx = xid / BNX2FC_TASKS_PER_PAGE;
2020 index = xid % BNX2FC_TASKS_PER_PAGE;
2021
2022 /* Initialize task context for this IO request */
2023 task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
2024 task = &(task_page[index]);
2025 bnx2fc_init_task(io_req, task);
2026
2027 if (tgt->flush_in_prog) {
2028 printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
2029 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2030 return -EAGAIN;
2031 }
2032
2033 if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
2034 printk(KERN_ERR PFX "Session not ready...post_io\n");
2035 kref_put(&io_req->refcount, bnx2fc_cmd_release);
2036 return -EAGAIN;
2037 }
2038
2039 /* Time IO req */
2040 if (tgt->io_timeout)
2041 bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
2042 /* Obtain free SQ entry */
2043 bnx2fc_add_2_sq(tgt, xid);
2044
2045 /* Enqueue the io_req to active_cmd_queue */
2046
2047 io_req->on_active_queue = 1;
2048 /* move io_req from pending_queue to active_queue */
2049 list_add_tail(&io_req->link, &tgt->active_cmd_queue);
2050
2051 /* Ring doorbell */
2052 bnx2fc_ring_doorbell(tgt);
2053 return 0;
2054 }
Linux with added FPC-III support